/*
  Copyright (c) Microsoft Corporation.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

import type { CallLog, ElementInfo, Mode, Source } from './recorderTypes';
import { CodeMirrorWrapper } from '@web/components/codeMirrorWrapper';
import type { SourceHighlight } from '@web/components/codeMirrorWrapper';
import { SplitView } from '@web/components/splitView';
import { TabbedPane } from '@web/components/tabbedPane';
import { Toolbar } from '@web/components/toolbar';
import { emptySource, SourceChooser } from '@web/components/sourceChooser';
import { ToolbarButton, ToolbarSeparator } from '@web/components/toolbarButton';
import * as React from 'react';
import { CallLogView } from './callLog';
import './recorder.css';
import { asLocator } from '@isomorphic/locatorGenerators';
import { toggleTheme } from '@web/theme';
import { copy } from '@web/uiUtils';
import yaml from 'yaml';
import { parseAriaKey } from '@isomorphic/ariaSnapshot';
import type { AriaKeyError, ParsedYaml } from '@isomorphic/ariaSnapshot';

export interface RecorderProps {
  sources: Source[],
  paused: boolean,
  log: Map<string, CallLog>,
  mode: Mode,
}

export const Recorder: React.FC<RecorderProps> = ({
  sources,
  paused,
  log,
  mode,
}) => {
  const [selectedFileId, setSelectedFileId] = React.useState<string | undefined>();
  const [runningFileId, setRunningFileId] = React.useState<string | undefined>();
  const [selectedTab, setSelectedTab] = React.useState<string>('log');
  const [ariaSnapshot, setAriaSnapshot] = React.useState<string | undefined>();
  const [ariaSnapshotErrors, setAriaSnapshotErrors] = React.useState<SourceHighlight[]>();

  const fileId = selectedFileId || runningFileId || sources[0]?.id;

  const source = React.useMemo(() => {
    if (fileId) {
      const source = sources.find(s => s.id === fileId);
      if (source)
        return source;
    }
    return emptySource();
  }, [sources, fileId]);

  const [locator, setLocator] = React.useState('');
  window.playwrightElementPicked = (elementInfo: ElementInfo, userGesture?: boolean) => {
    const language = source.language;
    setLocator(asLocator(language, elementInfo.selector));
    setAriaSnapshot(elementInfo.ariaSnapshot);
    if (userGesture && selectedTab !== 'locator' && selectedTab !== 'aria')
      setSelectedTab('locator');

    if (mode === 'inspecting' && selectedTab === 'aria') {
      // Keep exploring aria.
    } else {
      window.dispatch({ event: 'setMode', params: { mode: mode === 'inspecting' ? 'standby' : 'recording' } }).catch(() => { });
    }
  };

  window.playwrightSetRunningFile = setRunningFileId;

  const messagesEndRef = React.useRef<HTMLDivElement>(null);
  React.useLayoutEffect(() => {
    messagesEndRef.current?.scrollIntoView({ block: 'center', inline: 'nearest' });
  }, [messagesEndRef]);


  React.useEffect(() => {
    const handleKeyDown = (event: KeyboardEvent) => {
      switch (event.key) {
        case 'F8':
          event.preventDefault();
          if (paused)
            window.dispatch({ event: 'resume' });
          else
            window.dispatch({ event: 'pause' });
          break;
        case 'F10':
          event.preventDefault();
          if (paused)
            window.dispatch({ event: 'step' });
          break;
      }
    };
    document.addEventListener('keydown', handleKeyDown);
    return () => document.removeEventListener('keydown', handleKeyDown);
  }, [paused]);

  const onEditorChange = React.useCallback((selector: string) => {
    if (mode === 'none' || mode === 'inspecting')
      window.dispatch({ event: 'setMode', params: { mode: 'standby' } });
    setLocator(selector);
    window.dispatch({ event: 'highlightRequested', params: { selector } });
  }, [mode]);

  const onAriaEditorChange = React.useCallback((ariaSnapshot: string) => {
    if (mode === 'none' || mode === 'inspecting')
      window.dispatch({ event: 'setMode', params: { mode: 'standby' } });
    const { fragment, errors } = parseAriaSnapshot(ariaSnapshot);
    setAriaSnapshotErrors(errors);
    setAriaSnapshot(ariaSnapshot);
    if (!errors.length)
      window.dispatch({ event: 'highlightRequested', params: { ariaSnapshot: fragment } });
  }, [mode]);

  return <div className='recorder'>
    <Toolbar>
      <ToolbarButton icon='circle-large-filled' title='Record' toggled={mode === 'recording' || mode === 'recording-inspecting' || mode === 'assertingText' || mode === 'assertingVisibility'} onClick={() => {
        window.dispatch({ event: 'setMode', params: { mode: mode === 'none' || mode === 'standby' || mode === 'inspecting' ? 'recording' : 'standby' } });
      }}>Record</ToolbarButton>
      <ToolbarSeparator />
      <ToolbarButton icon='inspect' title='Pick locator' toggled={mode === 'inspecting' || mode === 'recording-inspecting'} onClick={() => {
        const newMode = {
          'inspecting': 'standby',
          'none': 'inspecting',
          'standby': 'inspecting',
          'recording': 'recording-inspecting',
          'recording-inspecting': 'recording',
          'assertingText': 'recording-inspecting',
          'assertingVisibility': 'recording-inspecting',
          'assertingValue': 'recording-inspecting',
          'assertingSnapshot': 'recording-inspecting',
        }[mode];
        window.dispatch({ event: 'setMode', params: { mode: newMode } }).catch(() => { });
      }}></ToolbarButton>
      <ToolbarButton icon='eye' title='Assert visibility' toggled={mode === 'assertingVisibility'} disabled={mode === 'none' || mode === 'standby' || mode === 'inspecting'} onClick={() => {
        window.dispatch({ event: 'setMode', params: { mode: mode === 'assertingVisibility' ? 'recording' : 'assertingVisibility' } });
      }}></ToolbarButton>
      <ToolbarButton icon='whole-word' title='Assert text' toggled={mode === 'assertingText'} disabled={mode === 'none' || mode === 'standby' || mode === 'inspecting'} onClick={() => {
        window.dispatch({ event: 'setMode', params: { mode: mode === 'assertingText' ? 'recording' : 'assertingText' } });
      }}></ToolbarButton>
      <ToolbarButton icon='symbol-constant' title='Assert value' toggled={mode === 'assertingValue'} disabled={mode === 'none' || mode === 'standby' || mode === 'inspecting'} onClick={() => {
        window.dispatch({ event: 'setMode', params: { mode: mode === 'assertingValue' ? 'recording' : 'assertingValue' } });
      }}></ToolbarButton>
      <ToolbarButton icon='gist' title='Assert snapshot' toggled={mode === 'assertingSnapshot'} disabled={mode === 'none' || mode === 'standby' || mode === 'inspecting'} onClick={() => {
        window.dispatch({ event: 'setMode', params: { mode: mode === 'assertingSnapshot' ? 'recording' : 'assertingSnapshot' } });
      }}></ToolbarButton>
      <ToolbarSeparator />
      <ToolbarButton icon='files' title='Copy' disabled={!source || !source.text} onClick={() => {
        copy(source.text);
      }}></ToolbarButton>
      <ToolbarButton icon='debug-continue' title='Resume (F8)' ariaLabel='Resume' disabled={!paused} onClick={() => {
        window.dispatch({ event: 'resume' });
      }}></ToolbarButton>
      <ToolbarButton icon='debug-pause' title='Pause (F8)' ariaLabel='Pause' disabled={paused} onClick={() => {
        window.dispatch({ event: 'pause' });
      }}></ToolbarButton>
      <ToolbarButton icon='debug-step-over' title='Step over (F10)' ariaLabel='Step over' disabled={!paused} onClick={() => {
        window.dispatch({ event: 'step' });
      }}></ToolbarButton>
      <div style={{ flex: 'auto' }}></div>
      <div>Target:</div>
      <SourceChooser fileId={fileId} sources={sources} setFileId={fileId => {
        setSelectedFileId(fileId);
        window.dispatch({ event: 'fileChanged', params: { file: fileId } });
      }} />
      <ToolbarButton icon='clear-all' title='Clear' disabled={!source || !source.text} onClick={() => {
        window.dispatch({ event: 'clear' });
      }}></ToolbarButton>
      <ToolbarButton icon='color-mode' title='Toggle color mode' toggled={false} onClick={() => toggleTheme()}></ToolbarButton>
    </Toolbar>
    <SplitView
      sidebarSize={200}
      main={<CodeMirrorWrapper text={source.text} language={source.language} highlight={source.highlight} revealLine={source.revealLine} readOnly={true} lineNumbers={true} />}
      sidebar={<TabbedPane
        rightToolbar={selectedTab === 'locator' || selectedTab === 'aria' ? [<ToolbarButton key={1} icon='files' title='Copy' onClick={() => copy((selectedTab === 'locator' ? locator : ariaSnapshot) || '')} />] : []}
        tabs={[
          {
            id: 'locator',
            title: 'Locator',
            render: () => <CodeMirrorWrapper text={locator} language={source.language} readOnly={false} focusOnChange={true} onChange={onEditorChange} wrapLines={true} />
          },
          {
            id: 'log',
            title: 'Log',
            render: () => <CallLogView language={source.language} log={Array.from(log.values())} />
          },
          {
            id: 'aria',
            title: 'Aria snapshot',
            render: () => <CodeMirrorWrapper text={ariaSnapshot || ''} language={'yaml'} readOnly={false} onChange={onAriaEditorChange} highlight={ariaSnapshotErrors} wrapLines={false} />
          },
        ]}
        selectedTab={selectedTab}
        setSelectedTab={setSelectedTab}
      />}
    />
  </div>;
};

function parseAriaSnapshot(ariaSnapshot: string): { fragment?: ParsedYaml, errors: SourceHighlight[] } {
  const lineCounter = new yaml.LineCounter();
  const yamlDoc = yaml.parseDocument(ariaSnapshot, {
    keepSourceTokens: true,
    lineCounter,
    prettyErrors: false,
  });

  const errors: SourceHighlight[] = [];
  for (const error of yamlDoc.errors) {
    errors.push({
      line: lineCounter.linePos(error.pos[0]).line,
      type: 'error',
      message: error.message,
    });
  }

  if (yamlDoc.errors.length)
    return { errors };

  const handleKey = (key: yaml.Scalar<string>) => {
    try {
      parseAriaKey(key.value);
    } catch (e) {
      const keyError = e as AriaKeyError;
      errors.push({
        message: keyError.shortMessage,
        line: lineCounter.linePos(key.srcToken!.offset + keyError.pos).line,
        type: 'error',
      });
    }
  };
  const visitSeq = (seq: yaml.YAMLSeq) => {
    for (const item of seq.items) {
      if (item instanceof yaml.YAMLMap) {
        const map = item as yaml.YAMLMap;
        for (const entry of map.items) {
          if (entry.key instanceof yaml.Scalar)
            handleKey(entry.key);
          if (entry.value instanceof yaml.YAMLSeq)
            visitSeq(entry.value);
        }
        continue;
      }
      if (item instanceof yaml.Scalar)
        handleKey(item);
    }
  };
  visitSeq(yamlDoc.contents as yaml.YAMLSeq);
  return errors.length ? { errors } : { fragment: yamlDoc.toJSON(), errors };
}